RESUMO
PURPOSE: To evaluate the influence of different metallic flask systems for acrylic resin denture processing on tooth displacement and framework misfit of mandibular fixed implant-supported complete dentures. METHODS: Standard mandibular implant-supported complete dentures in five implants were waxed and randomly assigned to three groups: G1 - conventional flask, G2 - double flask, and G3 - occlusion flask. Framework misfit in all the implants and the linear distances between teeth (I-I - incisor-to-incisor; P-P - premolar-to-premolar; M-M - molar-to-molar; RI-RM - right-incisor-to-right-molar; and LI-LM - left-incisor-to-left-molar) were measured before and after denture processing using an optical microscope. Dentures were processed by hot water curing cycle (9h/74°C). Collected data were analyzed by paired Student's t-test and one-way ANOVA (α=0.05). RESULTS: All the measured distances presented changes in tooth displacement after denture processing. However, the M-M distance for G1 (p=0.003) and the P-P (p=0.042) and LI-LM (p=0.044) distances for G3 showed statistically significant differences. Differences between the flask systems were not statistically significant. Statistically significant differences in the framework misfit due to denture processing were found for all the implants and groups, with the exception of right median implant for G2 and right distal implant for G3. A comparison of the flask systems found statistically significant differences in which G1 presented an increase in the misfit values and G2 and G3 a decrease. CONCLUSIONS: Different flask systems did not cause significant changes in tooth displacement. Frameworks misfit values were influenced by the different flask systems. The conventional flask presented an increase in the framework misfit, while the experimental flasks showed a decrease.
Assuntos
Materiais Dentários , Planejamento de Prótese Dentária/efeitos adversos , Prótese Dentária Fixada por Implante , Planejamento de Dentadura/efeitos adversos , Mandíbula , Metais , Ajuste de Prótese/efeitos adversos , Ajuste de Prótese/métodos , Mobilidade Dentária/etiologia , Dente Artificial , Resinas Acrílicas , Bases de Dentadura , Prótese Total Inferior , Falha de Prótese/efeitos adversos , Mobilidade Dentária/prevenção & controleRESUMO
Os autores através de uma revisäo da literatura, ressaltam a importância do enceramento de diagnóstico frente ao contorno das restauraçöes protéticas. Tentam deixar claro a importância do enceramento de diagnóstico tanto na fase de planejamento como durante o tratamento. Avaliam as teorias de contorno segundo seus autores, concluindo que devemos evitar o sobrecontorno das regiöes cervicais, através de um preparo adequado e um melhor entrosamento com o técnico de laboratório
Assuntos
Humanos , Dente/anatomia & histologia , Dentaduras , Dentaduras/efeitos adversos , Planejamento de Dentadura/efeitos adversos , Planejamento de Dentadura/normas , Reparação em Dentadura , Diagnóstico Clínico , Oclusão Dentária , Percepção de Forma , Técnicos em Prótese Dentária/normas , Restauração Dentária Permanente/métodosRESUMO
The authors report a clinical case of a patient who received a lower removable partial prosthesis with a T-bar clasp and developed the habit of sucking in her lower lip due the design of prosthesis, thus provoking gingival hyperplasia in the region close to the approach arm of the clasp. The importance of long-term follow-up for the preservation of a heathy mastigatory apparatus is also emphasized